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Finding the Fourth Proportional to 1,238.05, 1,855.65 and 622.18

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Solution

The fourth proportional to 1,238.05, 1,855.65 and 622.18 is: 932.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.05 : 1,855.65 = 622.18 : x
  2. Step 2: Convert to fraction form
    1,238.05/1,855.65 = 622.18/x
  3. Step 3: Cross multiply
    1,238.05x = 1,855.65 × 622.18
  4. Step 4: Simplify right side
    1,238.05x = 1,154,548.32
  5. Step 5: Solve for x
    x = 1,154,548.32/1,238.05
  6. Step 6: Final answer
    x = 932.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.